[sane-devel] Scanner Recommendation for long receipts?

[m. allan noah]

Most ADF scanners need to be told how long the paper is, so they can do
things like length-based double feed detection, buffering, blank page
detection, etc. However, the maximum length should be fairly long on most
machines I am familiar with. IIRC, some Canon and Fujitsu machines will go
up to one meter in length? I'll try to look around for some examples.

allan

On Mon, Aug 21, 2023 at 9:11 AM Andy Bennett <andyjpb at ashurst.eu.org> wrote:

> Hi,
>
> I don't have a solution I'm afraid but can offer some solidarity below!
>
>
> > like CVS/Walgreens long
> >
> > Is there a scanner out there that can scan up to 24"? or 36?
> >
> > I've been folding and making a multipage PDF.  Is there a better way?
> >
> > Is there a reason scanners must have a maximum length or could
> > they just stream data back to the PC continuously until the scan
> > is complete.  like a toilet paper roll for example.
>
> I have wondered about this too but not found any good implementations in
> desktop scanners.
>
> My ix500 has a scanning length that's not quite long enough for some
> things
> such as certain kinds of official certificates that are A4 width but have
> extra long fold out bits at the end.
>
> I'd suggest cutting the reciept into pieces, but I always hate a solution
> like that when there seems to be No Good Reason why the product doesn't do
> it in the first place. Besides, there may be good reasons to not want to
> cut your document into pieces for the sake of a scan.
>
> For my scenarios it often suffices to scan it one way up and then the
> other
> because the documents are less than twice the length the scanner can
> handle.
> ...but that still leaves an annoying amount of post-processing to do. It's
> even harder if the documents are particularly thin (like reciepts) because
> you're more likely to get a wobbly horizontal registration between the two
> scans.
>
>
> > I have no problem scanning a 700 page document if I keep that
> > ADF feder hopper full and keep the exit tray from filling up on
> > my ADF scanners.  But what reasons are there, that a single page
> > can not be say, 100 feet long?
>
> I guess none in principle. This one (done with a line scan camera which is
> similar to the single pixel-wide CCDs a scanner would use) is as long as a
> train: http://elm-chan.org/works/lcam/g/Y0008.jpg
>
> (via http://elm-chan.org/works/lcam/report.html )
>
> I've seen others that document entire long distance train journeys.
>
>
> Good luck and please let us know if you find anything!
>
>
> Best wishes,
> @ndy
>
> --
> andyjpb at ashurst.eu.org
> http://www.ashurst.eu.org/
> 0x7EBA75FF
>
>

-- 
"well, I stand up next to a mountain- and I chop it down with the edge of
my hand"
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